使用Swift与Segue一起发送数据 [英] Sending data with Segue with Swift

问题描述

我有两个视图控制器和两个视图。
在我的第一个视图中，我将变量'currentUser'设置为false。
我需要能够在第二个视图控制器中将'currentUser'设置为true。

I have two view controllers and two views. In my first view, I set the variable 'currentUser' to false. I need to be able to set 'currentUser' to true in the second view controller.

当尝试从第二个视图引用'currentUser'时它不是选择它作为'currentUser'在第一个视图控制器中定义。

When trying to reference 'currentUser' from the second view it's not picking it up as 'currentUser' is defined in the first view controller.

如何使用segue传递变量？

How do I carry across variables with segue?

推荐答案

使用segues将AnyController中的值设置为第二个

像这样：

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if(segue.identifier == "yourIdentifierInStoryboard") {

        let yourNextViewController = (segue.destinationViewController as yourNextViewControllerClass)
        yourNextViewController.value = yourValue

在yourNextViewController类中。

And in your yourNextViewController class.

class yourNextViewControllerClass {

    var value:Int! // or whatever

你也可以通过编程方式调用它：

You can call this also programmatically:

 self.performSegueWithIdentifier("yourIdentifierInStoryboard", sender: self)

将DestinationViewController中的值设置回主（第一个）ViewController

1。实施一个协议，例如创建一个名为protocol.swift的文件。

1. Implement a protocol, for example create a file called protocol.swift.

    protocol changeUserValueDelegate {
       func changeUser(toValue:Bool)
    }

2。设置第二个代表查看

    class yourNextViewControllerClass {

    var delegate:changeUserValueDelegate?

3。设置代表加载（prepareForSegue）

3. set the delegate on load (prepareForSegue)

    if(segue.identifier == "yourIdentifierInStoryboard") {

        var yourNextViewController = (segue.destinationViewController as yourNextViewControllerClass)
        yourNextViewController.delegate = self

4。添加功能FirstViewController

4. add Function to FirstViewController

    func changeUser(toValue:Bool) {
        self.currentUserValue = toValue
    }

5. 从SecondViewController调用此函数

5. call this function from your SecondViewController

     delegate?.changeUser(true)

6. 在FirstViewController中设置委托

6. Set the delegate in your FirstViewController

    class FirstViewController: UIViewController, ChangeUserValueDelegate {

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